We learn from the passage that the author's mother used to lay emphasis on ________.

A．parents should leave their children alone
B．kids should have more activities at school
C．it's time to be stricter with our kids
D．parents should always set a good example to their kids

A．they watch TV too much
B．they have done too much homework
C．they have to fulfill too many duties
D．teachers are too strict with them